Digikam is great for organizing photos on desktop, but there's still a essential feature that keeps me tied to Picasa (even if it has to be wine based) that is the possibility to sync albums on my library with online albums and optionalt sync only the starred photos. It's very practical because I don't have to bother if the photo has already been exported. Once the album is marked to be sync, if I put a star on a photo or remove it changes are automatically reflected on the online album. If Digikam implements something similar, it will be the best photo organizer ever.  

Reproducible: Always

Actual Results:  
Not avaiable

Expected Results:  
1. Select an album and choose an option to online sync
2. Choose the online service (Google Photos is essential for me, Facebook is desired and Flickr would let some other people happy)
3. Choose if the whole album will be synchronized or only photos above a certain number of stars
4. Whenever a new photo is added or starred on the album (dependigin of the previous choice) it will be exported to the online album. 
5.  Whenever a photo is deleted or looses the selected amount of stars, it will be removed from the online album.