Problems with facebook +1 / etc modules \ plugins - Joomla! Forum - community, help and support

hello!
i have site on joomla! 1.5.25 stable
whan try set social plugin or module ( tried socialshare buttons module, content - facebook-twitter-google+1, content - socbuttons plugins - install ok, when enable of this, clear output of webpages - mean, no output @ all, blank white page without in web browser. on home, , on link article - same, except socbuttons - enabled can white page, 1 text - site name utf text, nothing else.
very strange me, maybe can me this? modules , plugins work ok on site - nurte google adsense, editor-jce, rss...
at time encounter problem social shares buttons modules \ plugins - "google +1" , on...

got error messages - turn on debug , set debug info max - , get
parse error: syntax error, unexpected t_object_operator in /var/www/site.su/plugins/content/fb_tw_plus1.php on line 65

for facebook-twitter-google+1,

and
parse error: syntax error, unexpected t_string, expecting t_old_function or t_function or t_var or '}' in /var/www/site.su/plugins/content/socbuttons.php on line 21

for socbuttons plugin

and

parse error: syntax error, unexpected t_string, expecting t_old_function or t_function or t_var or '}' in /var/www/site.su/modules/mod_socialsharebuttons/helper.php on line 15

for e-max social share buttons module

i use •php version•: 4.4.4
in y site, can cause situation? maybe there have workaround, if because old 4.4.4 php?