[bug]user can access private photo by changing cards id
Merge pull request #121 from peterzd/fix_photo_privacy

[bug]user can access private photo by changing cards id
[chore]hide the four black circles
[chore]change invite friends to tag friends
Merge pull request #122 from peterzd/fix_small_bugs

Fix small bugs
Merge pull request #123 from peterzd/dev

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