Pilgrim’s Picks for May 1

Happy May Day everyone. If you live in Europe, I hope you’ve already had your turn dancing around the maypole.

For those of us less inclined to strap jingly-bells to our body, I present today’s Picks:

• LinkedIn’s average user is 41 and makes $110,000 a year. That’s how the social networking site is able to make a whopping $75 CPM on its advertising.
• Yahoo has made considerable upgrades to the images it uses for US cities in Yahoo Maps.
• Shortly after switching my email to Google Apps, I noticed an email spammer sending emails and pretending they were coming from my email account. I took care of it by adding an SPF record for my email and, thanks to Doug Karr’s reminder, you can do the same.
• I confess that I don’t use Meebo’s web-based instant messenging service, but enough people are using it that the company has raised $25 million in additional venture capital.