Twitter as 105 million users.

In kicking off Twitter’s Chirp developer conference, the company finally revealed its long mysterious registered user number, and it’s surprisingly large (based on some prior outside estimates): 105 million, or to be exact, 105,779,710, according to a slide showing behind Co-founder Biz Stone during his opening remarks.

The growth’s not over either — Twitter says its still adding 300,000 users per day. Moreover, as many have speculated, most of Twitter’s traffic — 75% of it in fact — comes from third-party clients and applications.