What is the US doing in Somalia?

What is the US doing in Somalia? As you might know, the US has been bombing and Special Operations Forces missions in Somalia since working with the Ethiopians on overthrowing the Islamist government. The Islamists actually brought stability to the country which has now been once again plunged into violent chaos. And the US is acting as it wants, conducting missions against so called terrorist threats. Do Americans know the US is doing this? What about the national sovereignty of Somalia? Is not the country's national sovereignty denied by these American military actions?