local player = game.Players.LocalPlayer or game.Players.PlayerAdded:Wait()

while wait(5) do
    --get your friends online
    local friendsOnline = player:GetFriendsOnline(10)

    --populate friends string
    local friendsString = "You have" ..  #friendsOnline .. " friends online!: \n "

    for i, friend in ipairs(friendsOnline) do
        friendsString = friendsString .. i .. ") " .. friend.Username .. " ( " .. friend.LastLocation.. ")\n"
    end

    --update gui
    script.Parent.Text = friendsString

end