Being an avid user of the internet, I have accounts in at least 5 social networks. Let's count Facebook, Google+, LinkedIn, Twitter, and Tumblr for now. And being an average user of Facebook, I do check for updates from my friends almost everyday, and put up links or updates once or twice a week. Then came the suggestion to change my profile picture as it had not been updated in quite a while (read 2yrs). I pushed it for a few weeks, but finally had to relent. I chose a picture, put it up on Facebook as my profile picture. But the story did not end there. Over the next week, I changed my Google(+) picture, and also at Twitter and LinkedIn. I though I was done, but today, I logged into Goodreads and saw my old picture again :(
Why isn't there one place to update our picture and have all networks use the picture? It could be as simple as having an option to provide a url of an image instead of getting a copy of the image - so that the new image at the said url is checked often, and the latest image updated!
Same problem exists with changing passwords as well. Having a single sign-on solution will solve this and more problems in one shot, but we could start small - with pictures, as the single-sign-on has been tried by several people but has not gained traction yet.