Technorati, still trying to figure out what it is, is now an online ad network: it has bought a small LA-based online ad network AdEngage. Terms of the deal were not disclosed. AdEngage was founded in 2004, and according to the company, serves about 12 billion ads on 4,000 sites each year, most of them smaller sites than Technorati’s own new-ish ad network. The company has also launched a private alpha of “Technorati Engage”, a self-service ad network for blogs and social media sites, based on the latest acquisition. More details here.

In August Technorati bought out Blogcritics, one of the oldest online blog magazines and blog networks, in an effort to boost its own content and ad network.

• Technorati Buys Online Blog Network Blogcritics
• In Search of a Business: Technorati Launching Blog Ad Network