Text talk is when people are to lazy to put in a whole word, so they shorten the word or use an acronym in it's place. Examples are: U, bbl, bbs, fp, np, etc.
Many people use text talk in the chat bar and in comics when too lazy to type a word. For example, people will use "BBL" on the chat bar, which means "Be Back Later", to show they are leaving. Another one famous only to Bitstrips is LKF, or Laugh, Kudos, Favorites, which are all positive ratings on a comic. To "LKF" means to give the ultimate thumbs up or aplaud to a comic.
Many users hate when text talk is used in comics, due to being called "lazy" and ruining a comics quality. The same goes for spelling errors, no punctuation and bad grammar.