Follow President Obama's Bay Area Visit Live

President Obama has arrived at San Francisco International Airport for a visit to the Bay Area today and Thursday.

Air Force One touched down exactly on schedule at 1 p.m.

Our Patch site down in Palo Alto, where Obama is holding a town hall meeting, is following the event live. .

Several demonstrations are being held in Palo Alto and San Francisco today in response to President Barack Obama's scheduled visits to Facebook headquarters for a town hall meeting and a fundraiser at the Nob Hill Masonic Center.

More than 100 people gathered in Palo Alto at 11 a.m. to call for protecting the nation's social safety net while addressing its budget problems. One of the main groups participating was Sacred Heart Community Service, an organization dedicated to addressing poverty in the Silicon Valley.

Unemployed and low-wage workers discussed how proposed cuts to federal programs would affect them. The demonstrators stood before a large banner created in the image of a Facebook page bearing Obama's photo. It read, "Low-income families need help."

CODEPINK, a grassroots peace and social justice movement, also planned a rally at 11 a.m. in front of Facebook headquarters to speak out against the Obama administration's foreign policy and war funding, event organizers said.

The Act Now to Stop War and End Racism, or ANSWER, coalition, will protest during the Democratic National Committee fundraiser at the Nob Hill Masonic Center in San Francisco at 7 p.m. The group will protest the wars abroad and ask for an end to budget cuts.

The town hall meeting will begin at 1:45 p.m. and will stream on the White House's Facebook page. The actual event with Facebook CEO Mark Zuckerberg will not be open to the public.

Obama will answer questions from the public and discuss his fiscal plan. Last week, he said he would reduce the nation's deficit by a cumulative $4 trillion over 12 years, in part by cutting defense spending, reducing health care costs and eliminating tax breaks for the wealthiest 2 percent of Americans.

Questions for the town hall can be submitted up to and during the event at facebook.com/WhiteHouse or WhiteHouse.gov/facebooktownhall.

Our Patch site in Palo Alto is also live-blogging in the visit from inside the Facebook headquarter. The liveblog updates can be read .

—Bay City News contributed to this story