can i link an entire album?

You can import images from an entire album if you want to. You can then use the images however you want. If you are looking for gallery + lightbox functionality I suggest you check out one of our other plugins Showcase https://dev7studios.com/plugins/showcase

can i integrate picasa and fb to showcase?

Yes Media Manager Plus integrates with Showcase.

That would mean i have to buy 2 plugins? I need this for unlimited install since i have several different wordpress sites

You would need to purchase Showcase yes. Media Manager Plus is free but if you want any premium extensions you would need to pay for them also.