1) to give information to be used as part of or a whole tweet on twitter in the near feature
2) information given through the medium of a tweet on twitter
3) as 1) but to be used by a third party for business twitter accounts, etc.
4) Information given via the medium of a twitter tweet
"I need tweetfo to update the company twitter with"
"this site would be a great tweetfo link"
"did you see that tweetfo on "such en such's" twitter?