Social Media:

• 20M Google+ users may exist by the weekend.

• Spotify plans to launch as invite-only in the U.S. this week.

• Google's Photovine site is live — it looks like a photo-sharing service.

• Google Streetview captures Japanese earthquake damage.

• Hulu relaunches Facebook integration. Can a free month of Hulu Plus offset privacy issues?

Mobile Computing:

• Android to offer better tablet optimization for smartphone apps.

Hardware:

• IBM unveils lower cost server for emerging markets.

• Citrix moves into the cloud With Cloud.com purchase.

Research & Stats:

• Android, iPhone, BlackBerry lead smartphone adoption: Pew Report.

Ecommerce:

• Amazon backs end to online sales tax in California.

• Google Offers beta launches in New York and Bay area.