Zilla is a free photo/video backup assistant that helps you to keep your memories backed up to your Flickr account.
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Yes, there is a limit on the number of tags which you can add to a Flickr photo. Flickr allows you to tag your photos so that you can easily add people to your photo's title & your comments by adding the '@' sign. A tag is a keyword which helps you to find things. You can add up to 75 tags to each photo or video. If you want to add more than 75 tags to a photo, then you will need to get the number of tags under that limit first.