Twitter Taps Former Topspin Media SVP as New Head of Music

Poll: Is Twitter List Spam Getting Out of Control?

Twitter’s Third Act: A New Design to Court the Mainstream

Dick Costolo Wrote the Twitter Playbook — Two Years Before He Joined the Company

Twitter Doles Out Stock Grants to Keep Top Talent

Twitter Files for IPO

Mark Zuckerberg Has Some Advice for Twitter’s IPO: Don’t Be Afraid

Twitter Buys Mobile Ad Exchange Startup MoPub for $350 Million

Google+ Brings Embedded Posts to Publishers (Just Like Twitter and Facebook)

Twitter Taps Google Ad Director Christian Oestlien to Lead Growth

Twitter Poaches Facebook Marketing Head Kate Jhaveri

Twitter General Counsel Alexander Macgillivray to Leave Company

Twitter Acquires Social TV Tracker Trendrr

Twitter Taps Ex-Ticketmaster CEO as Head of Commerce

Tune-In Was Big for MTV’s VMAs — What’s Twitter Got to Do With It?

Coder’s Site Tracks Trending Twitter GIFs in Real Time

Teens Actually Care About Their Mobile Privacy

Vine — Twitter’s “Little Video App That Could” — Continues to Grow

Twitter’s Head of Music Departs for Nielsen VP Gig

Fame On: Facebook Testing VIP-Only App