There are acutally great differences in offering too much information on twitter. One motive therefore can be to tell things you think are salacious. Those things either affect you in doing something thrilling you normally try to avoid or you like to provoke others.
But of course you can also use twitter to show you’re doing more interesting stuff than the others. The question would only be how the unknowing part-taking people would think about being used that way if only they knew:
Nah, pics will do.