Consuming more than you create -
Effective people tend to create a lot of content. Content can mean a lot of things - but the rule is always the same, create more than you consume.
Watching your own vanity metrics -
Everyone suffers from some level of vanity. A need to be liked. The Internet feeds that need, keeping popularity at the forefront of any online identity with lists of 'Friends,' 'Followers,' 'Connections,' 'Re-Pins' and even the 'Like' itself.
Starting the day responding to others -
Ineffective people allow others to set the agenda for their day. They start their morning reading or responding to others' requests.
Prioritizing the wrong activities -
Busy work. It's quite literally work that keeps you busy; it saps your time, but gets you no closer to your end goal.
Relying on multi-tasking to "save time" -
Multi-tasking is a scam. Being able to walk and chew gum at the same time may be the only true form of multi-tasking worth doing.