Earlier this week someone asked me which was better Flickr or Picasa, both are online photo sharing tools. I have used both – but I must admit that I found some articles from other experts rather than do extensive research myself. (After all I’m a librarian, not a tester!)
I found a couple of articles that lay out the differences:
http://www.priteshgupta.com/2009/05/flickr-picasa-web-albums/ – a great article – but it doesn’t give an opinion per se
http://www.stealblade.com/2010/01/facebook-photos-vs-flickr-vs-picasa-vs.html – they lean towards Picasa, but give some good reasons and mention other tools
http://labnol.blogspot.com/2006/12/picasa-web-albums-vs-flickr-which.html – they lean towards Flickr
It seems as if Flickr may be best if you want to build a community – for example invite others to add their image to your collection. Picasa is better if you think folks might want to download the images for any reason. The second article mentioned Facebook – which might be worth considering if your main goal is reaching people and you already dabble in Facebook at all.
Byte of the Week 
Hi,
There’s no clear winner as such.
But,
I prefer Flickr at times from a view point of a web designer.
But for home use, Picasa is decent.
I think there are ‘copyright’ issues with FB, ie. you assign them some level of copyright. ie. something along the lines of they can re-use it, if needed?
You may want to confirm this.
IMHO FLickr is much better. It has more users, more features and looks more polished. Basically if you’re a photographer you will get more ppl looking at your stuff than at Picasa. Maybe Picasa is better for private albums.