FARGO, N.D. (AP) — When Kevin Tobosa got word Thursday that a friend needed help building a sandbag dike, he immediately posted a status update on his Facebook page: “Heading to 2825 Lilac Lane in North Fargo — needs to be raised another 2 feet.” When city officials needed volunteers at other dikes, Tobosa suggested setting up a Facebook group. By Thursday, it had attracted more than 4,550 members. “We really need volunteers again today to get the dikes buttoned up and fill the rest of the sandbags,” read a message sent to the group Thursday. Social-networking sites such as Facebook and Twitter have become vital tools for volunteers as they wage a desperate, round-the-clock battle to protect Fargo from the river and spread the word about rising floodwaters.—-Contact The Daily Reveille’s news staff at [email protected]