Bootstrap is very familiar to a large number of developers, so it doesn’t hurt.
+1 for trello.com, excellent service.
Youtube, vimeo etc use iframes to deliver video, meaning that they will decide what type of video player to deliver. While some android web browsers can play flash content, html5 is a much better solution for handheld devices.
Pretty sure it can’t be done.
Best thing to do it just let the user choose images, and choose the gallery type somewhere else.
checkout trello.com it’s not a bug tracking software, but it can be used for something like that. It’s an excellent collaboration tool. Or you can use bitbucket, they let you have private repositories for free (up to five collaborators).
Biggest image stock websites have a feature in their algorithms that tries to “even out” the results presented to the buyer. You will almost never get the same results for the same exact search.
Weekly top sellers should be posted by category.
Why would I care what is the top seller for past week in WordPress if I’m interested in Ghost themes? Or if I’m looking for photography WP template instead of business theme.
There is a lot to be learned from stock photography sites and how they handle things.