You can download all social media videos with simple social media downloader. Here is a good tool to download facebook videos and videos from twitter and Instagram.

You need to check your internetspeed with free tools. Check your download and upload speed. Download also depends on the server from where you are downloading content.

I don't know what people are searching for. There are hell lots of sites you can watch anime on. Just google them and you will many working sites. Also, you can watchseriesonline for well-reputed anime websites.