6. Keep your photos private
One of the best things about Flickr is its front-and-center privacy controls, which you can easily modify when you upload images. You can set photos to be viewed by only you, your friends, family, or all Flickr users. Likewise, you choose who can comment and who can add notes, tags, and people. Specify your settings under the Privacy & Permissions tab under Your Account.
7. Easy e-mail uploading
Don’t have time to log in to Flickr or want to quickly send a photo from your phone? On the Emails & Notifications tab under Your Account, Flickr can generate an e-mail address to which you can directly send photos. Flickr can also generate specific e-mails for sending photos to Twitter and your Flickr blog.
Both FlickrFree for Android and Flickr for iPhone allow you to directly upload and download photos and browse through all your photos and sets. Flickr for iPhone also supports geotagging and instant uploads to Twitter.
9. Bring certain contacts closer
Click on a contact’s name or go to their photostream, and Flickr will state your relationship with another user as contact, friend, or family. Click on edit to change your relationship. Promoting a contact to friend or family will give him or her access to any photos, comments, or tags that you’ve assigned as friends or family only.
10. Tag your Flickr friends in your photos
Much like Facebook, Flickr lets you tag your Flickr contacts in your photos along with friends who are not on Flickr. Just click Add a Person under the Actions menu. Flickr notifies both members and non-members via e-mail that they have been added to a picture. Want to remain anonymous? Click the X next to your screen name under the People in this Photo section and no one (except for you) will be able to re-add your name.