Facebook’s first-quarter revenue jumped 45 percent year over year to $1.06 billion, but the company’s net income fell 12 percent to $205 million, according to an updated regulatory filing made with the Securities and Exchange Commission on Monday.

The social network revealed that it has added 56 million monthly active users (MAU) since Q4 2011 for a total of 901 million; the MAU trend trajectory indicates that Facebook will likely cross the 1 billion user threshold during the third quarter. While worldwide MAUs have grown fairly steadily over the past two years, U.S. and Canadian numbers have stagnated some. After adding only 3 million U.S. and Canadian MAUs between Q3 and Q4 2011, Facebook accrued another 9 million during Q1 to end the period with 188 million.

Facebook’s mobile user base also increased, adding 56 million worldwide mobile MAUs for a tally of 488 million users.