What's the point of using Amazon SimpleDB?

Question

I thought that I could use SimpleDB to take care of the most challenging area of my application (as far as scaling goes) - twitter-like comments, but with location on top - till

Answer 1

If the storage size per attribute is the problem you can use S3 to store larger data, and store the links to the s3 objects in SDB. S3 is not just for files, it's a generic storage solution.