By Sarah McBride SAN FRANCISCO (Reuters) – San Franciscans have long blamed the technology sector for rising rents. Now, a study from real-estate company Trulia backs them up. In January, it said, rents rose 3.3 percent in the nations 100 biggest metropolitan areas in January, but they rose by an average of 5.7 percent in the 10 biggest tech hubs. Landlords ask one-third more in rent for a typical two-bedroom unit in a tech hub compared with other big metro areas, the report said – $2,053, on average, compared with $1,504 in other metropolitan areas.