LOL

• [I'm so funny!]

• [What you just typed was very amusing]

• 'That's funny,' in a txt msg

• 2 funny!

• Cavalleria temptress

• Ha ha ha! online

• Ha ha ha on a PC

• Ha ha, in a chat room

• Ha ha! in chat rooms

• Ha ha! on the Internet

• Ha-ha, in e-mail

• Ha-ha, on-line

• Ha!, in chat

• Ha! online

• Hilarious, to texters

• I literally spit all over my keyboard, in short

• I'm giggling audibly, in e-mail

• I'm laughing audibly, in e-mail

• IMHO, that's hilarious

• LMAO alternative

• OMG ur so funny!

• OMG, that's sooo funny!

• OMG, too funny!

• That link was hilarious

• That's a riot!, in chat rooms

• That's funny, lazerpwned1983!

• That's funny, screenname123!

• That's funny, in chat rooms

• That's funny, in e-speak

• That's funny!, in an e-mail

• That's funny!

• That's funny! on the message boards

• That's funny!, in a chat room

• That's hilarious, when texting

• That's hilarious! in chat rooms

• That's hilarious! in cyberspeak

• That's too funny! in netspeak

• This cat picture you IM'd me is hilarious!

• U crack me up!

• U r a clown!

• u r fun-e

• U R funny!

• u r so funny

• UR 2 funny equiv.

• Very funny!, online

• Very funny! to Internet users

• You're killing me, in texts

• You're killing me, textually

• Abbr. near a smiley

• Abbreviated yuk

• AIM giggle

• AIM twitter

• Alternative to a smiley face emoticon

• AOL guffaw

• AOLer's chuckle

• Bit of high-tech amusement

• Bit of Internet mirth

• Chat chuckle

• Chat room That's a riot!

• Chat room abbr.

• Chat room acronym

• Chat room chortle

• Chat room chuckle

• Chat room chuckle (abbr.)

• Chat room chuckle, for short

• Chat room guffaw

• Chat room joke response

• Chat room laugh

• Chat room letter

• Chat room props

• Chat-room ha-ha

• Chat-room laughter letters

• Chatroom chortling

• Chatroom chuckle letters

• Chatroom chuckling

• Chuckle in a chat room

• Chuckle in an e-mail

• Computer expression

• Creme of 10cc

• Cyber-chortle

• Cyber-chuckle

• Cyber-chuckle hidden in this puzzle's theme entries

• Cyber-guffaw

• Cyber-yuk

• Cyberchuckle, and a hint to this puzzle's four longest answers

• Cyberroar

• Cybersnicker

• Cyberspace Ha-ha!

• Cyberspace chuckle

• Cyberspace guffaw

• Cyberspace snicker

• E-chortle

• E-chuckle

• E-guffaw

• E-mail cackle

• E-mail guffaw

• E-mail outburst

• E-roar

• Electronic gag reflex?

• Emoticon alternative

• Equivalent of ur 2 funny

• Facebook chuckle

• Follower of a chat room joke

• Funny-text reaction

• Giggle or guffaw, online

• Guffaw, in internet-speak

• Guffawing, in Internet lingo

• Ha ha, online

• Ha-ha, nowadays

• Hi-tech guffaw

• Hi-tech titter

• How an on-line chatter says That's funny!

• I.M. snicker

• IM Ha-ha!

• IM chuckle

• IM delight

• IM guffaw

• IMer's How funny!

• IMer's chuckle

• Internet chuckle

• Internet giggle

• Internet guffaw

• Internet laugh (abbr.)

• Internet lingo abbr.,this puzzle's theme

• Internet snicker

• Joke follower

• Joke response

• Keyed-in chuckle

• Letters to an on-line jokester

• Modern indicator of amusement

• Modern joke response

• More than te-hee, online

• Not quite ROTFL

• Not quite ROTFLMAO

• On-line cachinnation

• On-line chortle

• On-line chuckle

• On-line guffaw

• Online 'Ha ha'

• Online Ha!

• Online Oh, too funny!

• Online That's funny!

• Online display of amusement

• Online haw-haw

• Online hilarity

• Online joke response

• Online laugh

• Online prefix for cat

• Online shorthand in reply to a joke

• Online snickering

• Online yuk

• Part of many an AIM chat

• Possible reaction to a n00b

• Reaction not as strong as ROFL

• Reaction to ZOMG

• Reply to a funny IM, maybe

• Response to a funny text

• Response to a funny YouTube link, say

• Response to a joke in an I.M.

• Response to a joke on-line

• Response to an e-mail wisecrack

• Response to an e-mailed joke, maybe

• Response to an IM'ed joke

• Response to an on-line joke

• ROFL alternative

• ROFLMAO, but milder

• rotf, perhaps

• SMS interjection

• Text message guffaw

• Text te-hee

• Texter's chuckle

• Texter's guffaw

• Texter's roar

• Texter's tee-hee

• Texter's titter

• Texting guffaw

• Tickled texter's comment

• Tickled texter's titter

• Tickled user's response

• Titter in a tweet

• Twitter titter

• Type of amusement?

• Ubiquitous online initialism

• What might be sent to a card on the computer?

• Wisecrack response, in modern shorthand

• Yukking it up in cyberspace