Photo sharing sites, Photobucket, Picasa, etc

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I've used Photobucket for years and my Droid X had the option to upload the pics. It is very easy to then put those pics into threads like this one.

After 3 years I retired the Droid and moved on to a new Moto X. Great phone btw, I absolutely love it.

The Moto X has an option to upload pics to Picasa. I've never used that program before but apparently I have to dl it to my computer.

Does anyone else use Picasa? I'm trying to figure out if I should use that since the phone is already set up for it or should I try to figure out how to link to my Photobucket account.

Or, should I go to Flickr or some other site? Are they all the same? I still don't understand why I have to dl Picasa and install it.