Photos you usually want to share are JPGs and 'raring' them doesn't do much good in terms of space saving.

The only image files you'd like to compress are those that are taking too much space (tiffs, raw images, etc). And if you take the extra effort to put them into an archive it's likely that they are taking up really a lot of space.

Thus it's very very likely that even one of those images is too big to upload it to the internet (tens of megabytes if not more) with today's common end user internet connections.