Question

read gidgets blog. blog: gidget loves gadgets post: guys, you know me, you know that there isnt a device that i can resist. new technology! yippee! bring it on. but when i heard that they are soon going to bring cell - phone service to the subway tunnels i gasped. (okay, maybe it wasnt a gasp, but it sure was a sigh!) are you really going to unleash at least twenty - five cell - phone calls in a crowded train at rush hour? why cant people just make their calls on the subway platform before they get on the train? this is one case where just because we can do it, does it really need to be done? what is the purpose of this blog? to instruct and teach readers to advertise local businesses or products to offer technical explanations to persuade readers toward the writers point of view

Explanation:

The blogger expresses a personal opinion (disapproval of cell - phone service in subway tunnels) and tries to get readers to think about whether something (cell - phone use in crowded trains) is necessary. This is an attempt to persuade readers.

Answer:

to persuade readers toward the writer's point of view